bind_address

"127.0.0.1:12220"

Yes

Specifies that the server should bind to the given IP address and TCP port. In general, servers can bind to more than one IP address and port, but this is not (yet?) supported.

mode

"file"

Yes

Controls where server logging will go. Valid modes are "stderr-terminal" and "file". If the mode is `"stderr-terminal", human-readable output, with colors and other terminal formatting if possible, will be sent to stderr. If the mode is "file", Bunyan-format output will be sent to the filesystem path given by log.path. See also log.if_exists, which controls the behavior if the destination path already exists.

level

"info"

Yes

Specifies what severity of log messages should be included in the log. Valid values include "trace", "debug", "info", "warn", "error", and "critical", which are increasing order of severity. Log messages at the specified level and more severe levels will be included in the log.

path

"logs/server.log"

Only if log.mode = "file"

If log.mode is "file", this property determines the path to the log file. See also log.if_exists.

if_exists

"append"

Only if log.mode = "file"

If log.mode is "file", this property specifies what to do if the destination log file already exists. Valid values include "append" (which appends to the existing file), "truncate" (which truncates the existing file and then uses it as though it had just been created), and "fail" (which causes the server to exit immediately with an error).